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<html><head><style>img:hover { opacity: 0.5;}</style></head><body><h1>Image Transparency</h1><p>The opacity property is often used together with the :hover selector to change the opacity on mouse-over:</p><img src="img_forest.jpg" alt="Forest" width="170" height="100"><img src="img_mountains.jpg" alt="Mountains" width="170" height="100"><img src="img_5terre.jpg" alt="Italy" width="170" height="100"></body></html>